If you're the ethical type you can "buy" it on one of these services and then pirate it in order to keep it in perpetuity. If you're the less ethical type you can skip the "buying" step.
Even authors are dependent on their editors, so the idea of 'giving money to the people who create the things we like' is more complex than it may seem at first glance.
I don't care if some lawyer suit says it's ok because I really bought a license and not the content. Screw that. I bought a movie. If that's allowed by the law, the law deserves no respect.